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Publication Number: FHWA-HRT-04-079
Date: July 2006

Seasonal Variations in The Moduli of Unbound Pavement Layers

Appendix I: Trial Application Results Obtained With Soil Class Models

Figure 69. Section 040113 (Arizona) E versus E predicted for soil class models

Figure 69. Graph. Section 040113 (Arizona) E versus E subscript predicted for soil class models. The backcalculated modulus is graphed on the horizontal axis from 0 to 300 megapascals. The predicted modulus is graphed on the vertical axis from 0 to 300 megapascals. There are three layers: layers 2, 3, and 4. The subgrade error is at a minimum confidence of 95 percent and the base error is at the maximum confidence of 95 percent. Layer 2 has a few plots scattered between backcalculated modulus of 100-205 megapascals at predicted modulus of 80-240 megapascals. Layer 3 is scattered across backcalculated modulus of 90-200 megapascals at predicted modulus of 100-225 megapascals. Layer 4 remains plotted in a straight line horizontally across backcalculated modulus of 130-175 megapascals at predicted modulus of 110 megapascals. Both Layers 3 and 4 have a strong correlation and are plotted within the base error band.

Figure 70. Section 040114 (Arizona) E versus E predicted for soil class models

Figure 70. Graph. Section 040114 (Arizona) E versus E subscript predicted for soil class models. The backcalculated modulus is graphed on the horizontal axis from 0 to 400 megapascals. The predicted modulus is graphed on the vertical axis from 0 to 400 megapascals. There are three layers: layers 2, 3, and 4. The subgrade error is at a minimum confidence of 95 percent and the base error is at the maximum confidence of 95 percent. Layer 2 has four plots between the backcalculated 220-300 megapascals at predicted modulus of 100-140 megapascals. Layer 3 has four plots arranged between the backcalculated modulus of 200-250 megapascals and the predicted modulus of 325-375 megapascals. Layer 4 has four plots between the backcalculated modulus of 300-360 megapascals and predicted modulus of 225-250 megapascals. All three layers are plotted outside of the subgrade error. Only layers 2 and 3 are outside of the base error band.

Figure 71. Section 091803 (Connecticut) E versus E predicted for soil class models

Figure 71. Graph. Section 091803 (Connecticut) E versus E subscript predicted for soil class models. The backcalculated modulus is graphed on the horizontal axis from 0 to 400 megapascals. The predicted modulus is graphed on the vertical axis from 0 to 400 megapascals. There are three layers: layers 2, 3, and 4. The subgrade error is at a minimum confidence of 95 percent and the base error is at the maximum confidence of 95 percent. Layer 2 is scattered throughout the graph, between backcalculated modulus of 100-400 megapascals at predicted modulus of 125-300 megapascals. Layer 3 is plotted between the backcalculated modulus of 100-275 megapascals at predicted modulus of 160 megapascals. Layer 4 is clustered between backcalculated modulus of 220-400 megapascals at predicted modulus of 240-340 megapascals.

Figure 72. Section 131031 (Georgia) E versus E predicted for soil class models

Figure 72. Graph. Section 131031 (Georgia) E versus E subscript predicted for soil class models. The backcalculated modulus is graphed on the horizontal axis from 0 to 700 megapascals. The predicted modulus is graphed on the vertical axis from 0 to 700 megapascals. There are three layers: layers 2, 3, and 4. The subgrade error is at a minimum confidence of 95 percent and the base error is at the maximum confidence of 95 percent. Layer 2 is scattered between backcalculated modulus of 300-700 at predicted modulus of 200-500 megapascals. Layer 3 remains between 75-210 at 100-110 megapascals. Layer 4 is overlapping between backcalculated modulus of 50-110 megapascals at predicted modulus of 50-100 megapascals. Layers 3 and 4 are plotted within the base error band. Both have a strong correlation between backcalculated modulus and predicted modulus.

Figure 73. Section 231026 (Maine) E versus E predicted for soil class models

Figure 73. Graph. Section 231026 (Maine) E versus E subscript predicted for soil class models. The backcalculated modulus is graphed on the horizontal axis from 0 to 700 megapascals. The predicted modulus is graphed on the vertical axis from 0 to 700 megapascals. There are three layers: layers 2, 3, and 4. The subgrade error is at a minimum confidence of 95 percent and the base error is at the maximum confidence of 95 percent. Layer 2 is clustered between backcalculated modulus of 125-360 megapascals at predicted modulus of 100-300 megapascals. Layer 3 is lined up between backcalculated modulus of 100-210 megapascals at predicted modulus of 130 megapascals. Layer 4 is clustered between backcalculated modulus of 350-700 megapascals at the predicted modulus of 350-550 megapascals. The plots from the different layers are within the base layer and are significant soil class models.

Figure 74. Section 481077 (Texas) E versus E predicted for soil class models

Figure 74. Graph. Section 481077 (Texas) E versus E subscript predicted for soil class models. The backcalculated modulus is graphed on the horizontal axis from 0 to 700 megapascals. The predicted modulus is graphed on the vertical axis from 0 to 700 megapascals. There are two layers: layers 2 and 3. The subgrade error is at a minimum confidence of 95 percent and the base error is at the maximum confidence of 95 percent. Layer 2 is tightly clustered between backcalculated modulus of 110-250 megapascals at the predicted modulus of 125-225 megapascals. Layer 2 is within the base error band and is significant. Layer 3 is clustered between the backcalculated modulus of 200-525 megapascals at the predicted modulus of 100-225 megapascals. The majority of plots from layer 3 are outside the 95 percent confidence and therefore not significant.

Figure 75. Section 871622 (Ontario) E versus E predicted for soil class models

Figure 75. Graph. Section 871622 (Ontario) E versus E subscript predicted for soil class models. The backcalculated modulus is graphed on the horizontal axis from 0 to 700 megapascals. The predicted modulus is graphed on the vertical axis from 0 to 700 megapascals. There are three layers: layers 2, 3, and 4. The subgrade error is at a minimum confidence of 95 percent and the base error is at the maximum confidence of 95 percent. Layer 2 is loosely plotted between the backcalculated modulus of 200-600 megapascals at the predicted modulus of 200-650 megapascals. The majority of plots from layer 2 are within the base error and are therefore significant. Layer 3 is tightly clustered between backcalculated and predicted modulus of 120-200 megapascals. Layer 3 is within the 95 percent confidence and is therefore significant. Layer 4 is tightly clustered between the backcalculated and predicted modulus of 180-250 megapascals. Layer 4 is within the 95 percent confidence and is therefore significant.

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